Hi,
usually, when this happens it is because there is some conflict between your theme and WPAdverts. There are two ways to have it resolved.
1. install an Alt Term Links snippet https://github.com/simpliko/wpadverts-snippets/blob/master/alt-term-links/alt-term-links.php. It is quite easy to do and will work with any theme, the disadvantage is that the your Advert Category pages might not be indexed in Google.
How to install the snippet you can read here https://github.com/simpliko/wpadverts-snippets/ at the bottom of the page.
2. if you are familiar with PHP programming and WP API, then you can create a taxonomy-advert_category.php template file which will handle displaying the categories in a way that is compatible with your theme.
For more details please see here https://wpadverts.com/documentation/child-themes-and-templates/ a section “Custom Taxonomy Template”.
